upgrade to swift 5, #21

Author: Thomas Taschauer

OpenDocumentReader.xcodeproj/project.pbxproj

@@ -391,7 +391,7 @@
 				TargetAttributes = {
 					E2F7ED4E220B54D600D63515 = {
 						CreatedOnToolsVersion = 10.1;
-						LastSwiftMigration = 1010;
+						LastSwiftMigration = 1020;
 					};
 				};
 			};
@@ -877,7 +877,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = OpenDocumentReader/BridgingHeader.h;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -904,7 +904,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = at.tomtasche.reader;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = OpenDocumentReader/BridgingHeader.h;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;